<template>
  <div class="upload-container">
    <el-button :style="{background:color,borderColor:color}" icon="el-icon-upload" size="mini" type="primary" @click=" dialogVisible=true">
      upload
    </el-button>
    <el-dialog :visible.sync="dialogVisible">
      <el-upload
        :multiple="true"
        :file-list="fileList"
        :show-file-list="true"
        :on-remove="handleRemove"
        :on-success="handleSuccess"
        :before-upload="beforeUpload"
        class="editor-slide-upload"
        action="https://httpbin.org/post"
        list-type="picture-card"
      >
        <el-button size="small" type="primary">
          Click upload
        </el-button>
      </el-upload>
      <el-button @click="dialogVisible = false">
        Cancel
      </el-button>
      <el-button type="primary" @click="handleSubmit">
        Confirm
      </el-button>
    </el-dialog>
  </div>
</template>

<script>
// import { getToken } from 'api/qiniu'

export default {
  name: 'EditorSlideUpload',
  props: {
    color: {
      type: String,
      default: '#1890ff'
    }
  },
  data() {
    return {
      dialogVisible: false,
      listObj: {},
      fileList: []
    }
  },
  methods: {
    checkAllSuccess() {
      console.log(this.listObj);
      return Object.keys(this.listObj).every(item => this.listObj[item].hasSuccess)
    },
    handleSubmit() {
      const arr = Object.keys(this.listObj).map(v => this.listObj[v])
      console.log(this.checkAllSuccess);
      if (!this.checkAllSuccess()) {
        this.$message('Please wait for all images to be uploaded successfully. If there is a network problem, please refresh the page and upload again!')
        return
      }
      this.$emit('successCBK', arr)
      this.listObj = {}
      this.fileList = []
      this.dialogVisible = false
    },
    handleSuccess(response, file) {
      const uid = file.uid
      const objKeyArr = Object.keys(this.listObj)
      for (let i = 0, len = objKeyArr.length; i < len; i++) {
        if (this.listObj[objKeyArr[i]].uid === uid) {
          this.listObj[objKeyArr[i]].url = response.files.file
          this.listObj[objKeyArr[i]].hasSuccess = true
          return
        }
      }
    },
    handleRemove(file) {
      const uid = file.uid
      const objKeyArr = Object.keys(this.listObj)
      for (let i = 0, len = objKeyArr.length; i < len; i++) {
        if (this.listObj[objKeyArr[i]].uid === uid) {
          delete this.listObj[objKeyArr[i]]
          return
        }
      }
    },
    beforeUpload(file) {
      const _self = this
      const _URL = window.URL || window.webkitURL
      const fileName = file.uid
      this.listObj[fileName] = {}
      // return new Promise((resolve, reject) => {
      //   const img = new Image()
      //   img.src = _URL.createObjectURL(file)
      //   img.onload = function() {
      //     _self.listObj[fileName] = { hasSuccess: false, uid: file.uid, width: this.width, height: this.height }
      //   }
      //   resolve(true)
      // })
      return new Promise((resolve, reject) => {
    const img = new Image();
    img.src = _URL.createObjectURL(file);
    img.onload = function() {
      _self.listObj[fileName] = { hasSuccess: false, uid: file.uid, width: this.width, height: this.height };

      const canvas = document.createElement('canvas');
      const ctx = canvas.getContext('2d');

      // 压缩图片尺寸
      const maxWidth = 600; // 最大宽度
      const maxHeight = 400; // 最大高度
      let width = img.width;
      let height = img.height;

      // 计算原始宽高比例
      const aspectRatio = width / height;

      // 如果宽度或高度超过最大限制
      if (width > maxWidth || height > maxHeight) {
        // 如果宽度比例较大，则按照最大宽度进行缩放
        if (width / height > maxWidth / maxHeight) {
          width = maxWidth;
          height = Math.floor(width / aspectRatio);
        } else {
          // 否则按照最大高度进行缩放
          height = maxHeight;
          width = Math.floor(height * aspectRatio);
        }
      }

      canvas.width = width;
      canvas.height = height;

      // 在画布上绘制压缩后的图片
      ctx.drawImage(img, 0, 0, width, height);

      // 将画布内容转换为Blob对象
      canvas.toBlob((blob) => {
        // 创建一个新的File对象，将压缩后的图片数据存入
        const compressedFile = new File([blob], file.name, { type: file.type });

        // 替换原始文件对象
        resolve(compressedFile);
      }, file.type, 0.5); // 调整压缩质量
    };
  });
    }
  }
}
</script>

<style lang="scss" scoped>
.editor-slide-upload {
  margin-bottom: 20px;
  ::v-deep .el-upload--picture-card {
    width: 100%;
  }
}
</style>
